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Stereoscopic PIV measurements of a screeching supersonic jet

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Abstract

The effect of acoustic feed back on global flow response is illustrated through an example of a rectangular screeching jet operating at a nominal Mach number of 1.69. Using a stereoscopic Particle Image Velocimetry, the detailed flow characteristics within a screeching cycle are obtained with fidelity. To resolve the “bias” errors inherent with standard PIV image processing technique, a novel mesh-free and high spatial resolution scheme is implemented to yield accurate velocity measurements in a complex three-dimensional supersonic flow. The axis-switching phenomenon that arises due to unusual mixing enhancement in the minor axis plane of a rectangular jet is vividly displayed. Strong streamwise vortex structure in the jet shear layers, enhanced by the inherent instability of the shear layer, is reported.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Florida A&M University and Florida State University, 32310, Tallahassee, Florida, USA

    Alkislar M. B. (Graduate Research Assistant)

  2. Department of Mechanical Engineering, Florida A&M University and Florida State University, 32310, Tallahassee, Florida, USA

    Lourenco L. M. (Professor)

  3. Department of Mechanical Engineering, Florida A&M University and Florida State University, 32310, Tallahassee, Florida, USA

    Krothapalli A. (Professor and Chair)

Authors
  1. Alkislar M. B.
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  2. Lourenco L. M.
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  3. Krothapalli A.
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Additional information

Mehmet Bahadir Alkislar: He is a PhD candidate in the department of Mechanical Engineering at Florida State University in Tallahassee. Mr. Alkislar received his MS degree in 1993 from Department of Aeronautical Engineering at Middle East Technical University, in Ankara, Turkey. He completed the Diploma Course Program and Advanced Research Orientation Program at von Karman Institute for Fluid Dynamics. His research interests include: aeroacoustics, aerodynamics, jets, shear layers, experimental methods and optical diagnostics.

Luiz Lourenco: He is a Professor of Mechanical Engineering at Florida A&M and Florida State Universities in Tallahassee. Professor Lourenco received his D.Sc. from the University of Brussels, Belgium in 1982. His research interests include: biomedical and biofluids engineering, experimental methods, optical diagnostics, two-phase flows and heat transfer.

Anjaneyulu Krothapalli: He is the Don Fuqua Eminent Scholar, Professor and Chairman of Mechanical Engineering at Florida A&M and Florida State Universities, Tallahassee. Professor Krothapalli obtained his Ph.D. in Aeronautical and Astronautical Engineering from Stanford University in 1979. He has been on the faculties of Aerospace Engineering at the University of Oklahoma (1979–1980) and the Department of Aeronautics and Astronautics at Stanford University (1981–1983). His research interests include: aeroacoustics, aerodynamics, jets, wakes and optical diagnostics.

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Alkislar, M.B., Lourenco, L.M. & Krothapalli, A. Stereoscopic PIV measurements of a screeching supersonic jet. J Vis 3, 135–143 (2000). https://doi.org/10.1007/BF03182406

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  • DOI: https://doi.org/10.1007/BF03182406

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